The HeatMiner® visual data mining technology developed by Agience Oy Ltd can visualize 4-dimensional data as a heatmap (e.g. an excel sheet with 4 columns). Three of the dimensions define xyz-coordinates of data points and HeatMiner illustrates the fourth dimension with a color summarizing the average of values around in each xyz-point. Although the final visualization is presented using "only" 3d-graphics, the fact that original input data had 4 columns justifies calling this visualization type a '4d-heatmap'.